Ouch. While playing with this file, I switched to 2013. No help for a 2011 user.
Here's a Parasolid (minimal filesize). If you need more, send me a mail at email@example.com
Here's a cleaned-up version in 2011, with better shape of 3DSpline of the helix, and modeling improvements.
And now, the edge between red and yellow face is looking much better
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